IIIF Color HighRes
National Institute of Informatics - Digital Silk Road Project
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| IIIF Color HighRes |
| Scientific Results of a Journey in Central Asia, 1899-1902 : vol.2 |
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| A WIND-WORNSTONE, QUARTZITIC SANDSTONE. FROM THE DESERT OF LOP. |
Citation Information
SPECIMENS OF SAND, DUST, AND MUD. 469
for the layer exhibits specimens of Limnæa auricularia, (a variety of the same species, which occurs everywhere throughout the old basin of Lop-nor, is called L.
ovata) and a species of Planorbis, very closely resembling P. marginatus, but
without the lip to the shell; also the vertebra of a fish. This last is however so decayed that it is impossible to determine what species it belongs to; though there
can hardly be a doubt but that it belongs to one of the species of fish now living
in the Kara-koschun. Did time and opportunity permit, an examination of the various layers over a small area would probably reveal numerous vertebræ of fish, if not
entire skeletons. The discoveries would however all belong to the same species, and investigation would hardly pay for the trouble, because we already possess more than sufficient proofs that this spot was formerly situated on the shore of a
freshwater lake.
The fourth layer from the bottom is a light yellowish grey, and rather strongly calciferous. Like the layer immediately below it, it contains shells of the same species of Planorbis as well as the seed-vessel of some plant. The topmost layer is also light yellowish grey, is intermingled with fine sand, and is rather calciferous. It contains shells of Limnœa auricularia and the same species of Planorbis as the two layers immediately below it. In this layer the vegetable remains are more abundant than in the lower layers.
On Pl. XX I have brought together a number of mollusc shells from the Desert of Lop. In the top row are five more or less well preserved specimens of Limnæa slagnalis; in the second row seven specimens of Limnæa auricularia, especially well-preserved and free from blemish, probably they were quite recently dissected by the wind out of the freshwater sediment in which they lay inclosed for centuries. In the third row we have nine more examples of the same species; their bleached appearance, rough exterior, and jagged edges show that they have been for a long time exposed to the influence of the atmospheric elements; from this cause they become eventually brittle and crumble to fragments, and finally are destroyed altogether. The fourth row contains nine more specimens of Limnæa
auricularia, still filled with clay as hard as cement, with Fig. 200. A WIND-WORN STONE,
sand and fragments of shells, which they brought with them QUART D SANDSTONE.
FROM THE E DESERT OF LOP.
from the sedimentary beds in which they lay buried. The
fifth row consists of ten small, well preserved examples of the same species, which have quite recently been exposed. In the lowest row are specimens of Li,n;u-ca ovata and Planorbis, taken out of the three uppermost layers of the last vertical section from Lôu-lan.
Finally, I adduce the results of the examination of certain specimens of fluviatile mud. The first was taken out of the bed of the Jarkent-darja at Schäschkak
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